How do you turn voltage into running time?

[GatorDeb]

I plan to buy this:
http://dealextreme.com/details.dx/sku.3205

How do I figure out how long 4 X 2300 mah batteries would power an 80gig iPod Video playing videos continuously? How about powering an 8 gig iPod Nano?

(and this powers anything that can connect to USB, so in a tangent I would also like to know how long this would power a Cingular 8125 phone).

Thanks!

 

[bobb-mini]

Where did u get the 2300 number? (number better applied to AA batteries)

Looks like a typical AAA puts out 1000 mah, and that's what this gadget says its capacity is "POWER OUTPUT: USB DC 5.0V 1000mAh."

It's very simple. Find out your Nano/iPod built-in capacity. Let say your Nano has an internal battery of 500mAh and lasts u 10 hours..... then this gadget will give you ~20 hours of additional service.

 

[mnhnhyouh]

I think your math may be a little off....

If a 500mAh gets you 10 hours, the 2300mAh battery, being 4.6 times the capacity, will get you 46 hours, or 36 additional hours.

h

 

[GatorDeb]

I realized it was AAA so I bought an AA version somewhere else

That's the thing, how do you find out what the iPod's, or other electronics', battery is?

Also if the iPod has 1 500MAH battery, wouldn't this be 2300 X 4? Or you just count the 4 cells as 1 2300?

 

[bobb-mini]

That's the thing, how do you find out what the iPod's, or other electronics', battery is?

1. Read the iPod manual.
2. Digg through iPod's technical specs.
3. eBay for iPod replacement batteries.

Also if the iPod has 1 500MAH battery, wouldn't this be 2300 X 4? Or you just count the 4 cells as 1 2300?

The second thing u said. The 4 AA cell are connected serially (back-to-back) to provide u with 5 volts, the total system capacity is still 2300mAh.